Transmitter control device



Aug. V5, 1952 P.G. J." M. AUDEMAR TRANSMITTER CONTROL DEVICE 2 Sl-IEETS-SI'XEET `l Filed Jun@ 2s, 1947 Aug- 5, 1952 P. G. J. M. AUDEMAR .TRANSMITTER CONTROL DEVICE l2 SHEETS--SHEET 2 Filed June 26, 1947 Patented Aug. 5, 1952 TRANSMITTER CONTROL DEVICE Pierre Guillaume Joseph Marie Audemar, La

Garenne-Colombes, France, assign'or to Olaer- Marine, Paris, France, a society of France Application June 26, 1947, Serial No. 757,303

Germany January 21, 1941 section 1, Publicraw 69o, August s, 194.6 Patent expires January 21, 196i 3 Claims.

The present invention relates to transmitter for hydraulic control systems of the type connected by two pipes to opposite sides of an actuated piston.

The object of ymy invention is to provide a device of the type above mentioned ensuring an automatic locking of the parts to be controlled Without requiring the use of special apparatus for this purpose.

Another object of my invention is to provide a device of said type which permits of passing from an operation in one direction to the operation in the opposite direction Without requiring the use of auxiliary control devices.

With this object in view, according to my invention, the device including two pump units symmetrically disposed with respect to each other and communicating with a common reservoir for the control liquid and preferably housed in opposite sides of a casing filled with said liquid, so as to constitute said reservoir, said pump units being adapted to be operated by a single oscillat- (Cl. S-41) ing member driven by a control lever, is characterised in that the respective pistons are mechanically independent of each other and arranged in such manner that when one of said pistons is'being driven by the oscillating member through the' vaction of the lever moved the desired number of times with a reciprocating motion on one of the sides of its neutral position, the piston of the other pump unit remains stationary, while the return circuit of said last mentioned pump' unit enabling the liquid to return into the reservoir is released, and that when the lever is in its neutral position, both of the return circuits of the pump units are automatically shut.

According to a preferred embodiment of my invention, the device essentially includes a casing filled with a liquid such, for instance, as oil, in which is mounted a shaft, one of the ends of which extends through one of the walls of the casing and is provided, on the outside of said casing, with a control lever.

On that shaft is fixed, on the inside of the casing, a part adapted to receive a rotational movement together with said shaft.

The two portions of the casing located on either side of the control shaft are arranged in such manner as to constitute the body of two pumps of horizontal axis located symmetrically with respect to the shaft. The pistons of these pumps are controlled by a roller carried by the part xed on the shaft. Said part further constitutes two symmetrical cams capable of acting on valves cooperating with the two pumps re- 2 spectively, and permitting, when one of the pumps is in operation, of short-circuiting the other. Inthis way, one of the pumps will be caused to Work with the desired number of strokes, While the other pump remains short-circuited, after which the second mentioned pump can be brought into work, without any intermediate operation, while automatically and simultaneously bringing the first pump into shortcircuited position. f

When the control lever is in the intermediate position, the apparatus ensures the automatic blocking in both directions.

A preferred embodiment of the present invention Will be hereinafter described with reference to the accompanying drawings given merely by way of example and in which:

Fig. l is a vertical section of the apparatus, and

Fig. 2 is a section on theline X-X of Fig. 1.

Referring to the drawing, reference numeral I designates the casing lled with oil up to a certain level. This oil is kept at atmospheric pressure owing to the provision of an aperture 2 in casing I.

A shaft '4 extends through the wall 3 of the casing and is journalled in the opposite wall y5 of said casing, its fluid tightness being obtained through a suitable packing such, forinstance, as that shown at 6.

Shaft 4 carries a lever 1 provided at its end with a handpiece B for actuating it.

The sides 9a and '9b of casing I are provided with two extensions Ia and Illb forming the pump bodies which are wholly identical and symmetrically disposed with respect to the axis XX of the apparatus. In the following specification, it` will therefore suffice to describe one of these pumps:

Each pump comprisesa bore II forming the pump cylinder and a plunger piston I2. This piston is pushed outwardly by spring I3 housed in a longitudinal bore communicating with a conduit leading to the reservoir which is shut by a spring loaded ball check valve I4 during the discharge stroke of the piston I2. Pump body Illa. (or |012) is also provided with a second bore I5 parallel` to bore II and provided With two check-valves IE and I'I applied against their respective seats I8 and I9 by a spring 20.

2| are the outlet orifices of the two pumps leading respectively. to the opposite sides of-the device to be controlled. Bore I5 communicates 3 check valves I6 and I1 are closed and the conduit starting from orifice 2| is blocked. When one pump is feeding liquid to the device to be controlled, its valve I1 is applied against its seat and its check valve I6 works as an ordinary outlet valve.

On the portion of shaft v4 located inside the casing, there is keyed a member 23 made of two disc-shaped portions between which extends a spindle 24 on which is journalled a roller 25. On the other hand, symmetrically with respect to axis X-X, I provide inside the casing two spindles 26 carrying plates 21 respectively adapted to rotate about said spindles. These two plates are urged toward each other by spring 28, which is fixed to said plates by rings 29.

Thus, the lower portion of the plates are elastically urged toward the axis of the apparatus. A push rod 32 and ball valve I1 is slidably mounted in return passage 35 and extends within casing i to contact the lower end of plate 21, the diameter of rod 32 being smaller than that of passage 35, so that liquid flowing through conduit 2l can return through passage 35 into casing i when ball valve I1 is raised'from its seat I9 by means of pushrod 32.

Referring especially to Fig. 1, it will be seen that discs 23 are each in the form of a cam symmetrical with respect to axis X-X, the diameter of the upper portion of the cam being greater than .the'diameter of the lower portion and these two portions joined together by inclined parts 3B.

Between disc 23, on the one hand, and each of the 'plates 21, on the other hand, there is provided a roller 3|. When operating member 8 is inV the neutral position illustrated by Fig. l, rollers 3l bear against the portions of small diameter of disc"23 and the valves I1 are spring pressed in their seats I9.

On the contrary, as soon as the operative lever is actuated in one direction or the other, the roller 3i located on the side toward Which the operating lever is actuated immediately passes upon the portions of greater diameter of the disc and the correspondingball l1 is lifted from its seat by its rod 32 and its plate 21, thus permitting the liquid returning through pipe 2i to one of the pump bodies (lila and lb) during the working stroke of piston I2 in the other pump body, to flow through return passage `35 directly back into the reservoir. The pump that is considered is thus placed into short-circuited position.

In order to work one of the pumps, the operating lever is actuated by pivoting it toward the left or toward the right' from its neutral position shown by Fig. l, without moving past said neutral position in the opposite direction. As soon as the operating lever is moved away from its neutral position in one direction or the other, the pump located 'on the side toward which the lever is inclined, is short-circuited. On the contrary, the other pump is actuated by roller 25 which acts upon plunger piston I2. It is thus possible to impart any desired number of successive displacements to the operating lever and to send liquida corresponding number of times into the desired pump without exerting any action upon the other pump. It suices, at the end of the operation, to bring back the operating lever into neutral position for blocking both of the conduits and it is then possible to act in the same manner on the opposite pump while simultaneously blocking the first-mentioned pump into short-circuited position.

The device 'further includes abutments 33 against which bear shoulders 34 of the plunger pistons. In this way, neither of said pistons can come into contact with the roller 25 when the latter is in neutral position or has not been moved to a certain extent from said neutral position in either direction.

It will be readily understood that with the device according to the invention, it is possible to control important displacements since duid under pressure can be delivered any desired number of times in the desired direction and this as long as the operation has not been completed. Owing t0 the type of check valve pump that is utilized, it is possible to work at very high pressure, which permits of reducing the size of the jacks to be controlled.

Furthermore, as above explained, the device produces an automatic blocking of the conduits which is not possible, for instance, when rotary pumps are used.

Finally, it suiiices to act always on the `same operating member, to wit lever 8, for producing the movements in one direction or the other without bringing into play auxiliary members of any kind whatever.

The apparatus according to my invention therefore permits of performing all desired operations invboth directions and thus replaces two control apparatus, the pump that is not to work for a given operation being automatically brought into short-circuited relation and the blocking being ensured when the operating lever is in neutral position.

While I have, in the above description, disclosed what I deemv to be practical and efficient embodiments of the invention, it must be well understood that I do not wish to be limited thereto as there might be changes made in the form, disposition and dimensions of the parts without departing fromv the principle of the present invention as comprehended within the appended claims.

What I claim is:

l. A liquid pressure generator comprising a casing containing said liquid, two pump cylinders carried by said casing, symmetrically to each other with reference to a vertical median plane, a piston yieldingly operated by means of a spring in each of said pump cylinders, two conduits starting each from a pump cylinder, respectively, for the circulation of said liquid, an outwardly opening check valve in each of said conduits, a return passage between a point of each of said conduits located beyond said check valve and said casing, valve means in each of said return pas sages, elastic means for urging said valve means toward the closed position, a shaft journalled in said casing about an axis located in said median plane, at least one disc keyed on said shaft, a roller carried by said disc adapted to press either of said pistons against the tension of said springs, the periphery of,` said disc forming a cam of circular outline of smaller diameter on the half thereof opposed to said roller, a rod slidable in each of said return passages, means controlled by said cam and adapted to move said rods so as to open the valve means corresponding to the piston which is not being actuatedby said roller, apassage between each cylinder and said reservoir, andan inlet valve in each of said passages'for placing each pump cylinder in communication with saidreservoir `during the return stroke of the corresponding piston and cutting on" said communication during the outstroke of said piston; Y

2. A construction as dened in claim 1, wherein said cylinders are provided with abutments for limiting the movements of said pistons toward said roller, so that neither of said pistons is in contact with said roller when the pump actuating lever is in its neutral position.

3. A liquid pressure generator comprising a casing having a central portion forming a reservoir for said liquid and two symmetrical extensions at opposite sides of said reservoir, a cylinder formed in each of said extensions, pump plungers in said cylinders, elastic means in said cylinders urging said plungers in one direction, a conduit starting from each cylinder for the circulation of said liquid, a return passage between eaeh of said conduits and said reservoir, valve means in each of said return passages adapted to normally shut the same, a shaft extension within said reservoir, a lever mounted on said shaft for actuating said plungers, an oscillating member fixed on said axis and carrying an element located between said plungers and adapted to press one or the other plungers against the tension of said elastic means when said lever is operated, and means intermediate said valve means and said oscillating member for opening said valve means in the movement of said lever, the arrangement being such that when said lever is moved on one of the sides of its neutral position in order to pump liquid from said reservoir into the conduit starting from one of the pump cylinders, the valve means in the return passage between said reservoir and the conduit starting from one of the other cylinders automatically opened so as to permit the liquid returning through the last mentioned conduit to flow back into the reservoir.

PIERRE GUILLAUME JOSEPH MARIE AUDEMAR.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS 

